Abstract
We report on the fabrication and characterization of hollow-core photonic bandgap fibers that do not suffer from surface mode coupling within the photonic bandgap of the cladding. This enables low attenuation over the full spectral width of the bandgap--we measured a minimum loss of 15 dB/km and less than 50 dB/km over 300 nm for a fiber operating at 1550 nm. As a result of the increased bandwidth, the fiber has reduced dispersion and dispersion slope--by a factor of almost 2 compared to previous fibers. These features are important for several applications in high-power ultrashort pulse compression and delivery. Realizing these advances has been possible due to development of a modified fabrication process which makes the production of low-loss hollow-core fibers both simpler and quicker than previously.
Highlights
Unlike conventional fibers that guide light by total internal reflection, in a hollow-core photonic bandgap fiber (HCPBGF) light is confined and guided by a photonic bandgap that prohibits the propagation of light in the cladding region under certain conditions [1]
The performance of previously reported low loss HC-PBGFs has been limited by surface modes localized at the core cladding interface which couple to the core-guided mode, decreasing the useful bandwidth of the fibers and increasing the dispersion and dispersion slope
We have demonstrated 7-cell HC-PBGFs with a novel core geometry incorporating a thin core/cladding interface
Summary
Unlike conventional fibers that guide light by total internal reflection, in a hollow-core photonic bandgap fiber (HCPBGF) light is confined and guided by a photonic bandgap that prohibits the propagation of light in the cladding region under certain conditions [1]. The performance of previously reported low loss HC-PBGFs has been limited by surface modes localized at the core cladding interface which couple to the core-guided mode, decreasing the useful bandwidth of the fibers and increasing the dispersion and dispersion slope. 2. Fiber fabrication and optical properties Our fiber design is based on numerical computations which show that if the core walls have just half the thickness of the struts in the cladding surface mode can be suppressed [3].
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